Linear vibration motor

Abstract

A linear vibration motor is disclosed. The linear vibration motor, includes a housing provided with an accommodation space; a vibrator accommodated in the accommodation space; and an electromagnet accommodated in the accommodation space. The vibrator includes a weight having a through-hole and a plurality of permanent magnets engaging with an inner wall of the through-hole. A number of elastic connecting parts are accommodated in the accommodation space, one end of the elastic connecting part connected with the housing and the other end connected with the weight for suspending the vibrator in the accommodation space. The electromagnet includes an iron core and a coil around the iron core for producing magnet fields interacting with the permanent magnets further for producing attracting and repelling force to drive the vibrator to vibrate.

Description

FIELD OF THE PRESENT DISCLOSURE[0001]The present disclosure relates to the vibration motors, and more in particularly to a linear vibration motor used in portable electronic product.DESCRIPTION OF RELATED ART[0002]Along with the development of electronic technology, portable consumer electronics are more and more popular among people, such as mobile phone, palmtop video game player, palmtop multimedia entertainment devices and so on. These electronic products generally adopt linear vibration motor for system feedback.[0003]At present, the linear vibration motor creates driving force by magnetic lines produced by the permanent magnet to pass through the electrified coil for driving the linear vibration motor to vibrate. However, the magnetic lines produced by the permanent magnet will be reduced in related vibrators, therefore the driving force is smaller. The size of the permanent magnet can be increased to compensate the loss of magnetic lines, however, this would increase the weig...

AI Technical Summary

Benefits of technology

[0015]After the coil 102a is applied with electric power, the iron core 102b is magnetized and becomes a magnet. The magnetic field of the magnet interacts with the magnetic field of the electromagnet 102, which greatly increases the magnetic force of the coil 102a, and the electromagnet 102 produces a greater magnetic force. The vibrator 104 includes a permanent magnet 104a. The magnetic pole of the permanent magnet 104a is set opposite to the end of the iron core 102b of the electromagnet 102. The permanent magnet 104a is located within the range of the magnetic field generated by the electromagnet 102. After the coil 102a is applied with electric power, the permanent magnet 104a is attracted and repelled by the electromagnet 102 and moves back and forth, thereby the vibrator 104 vibrates with an improved vibration effect.

Problems solved by technology

The size of the permanent magnet can be increased to compensate the loss of magnetic lines, however, this would increase the weight of the vibrator, and create additional load on the part supporting the vibrator.

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